Add support for exclusive mode

docs/input/live/index.cshtml

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+Title: Live Displays
+Order: 4
+---
+
+<h1>Sections</h1>
+
+<ul>
+@foreach (IDocument child in OutputPages.GetChildrenOf(Document))
+{
+  <li>@Html.DocumentLink(child)</li>
+}
+</ul>

docs/input/live/progress.md

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+Title: Progress
+Order: 5
+RedirectFrom: progress
+---
+
+Spectre.Console can display information about long running tasks in the console. 
+
+<img src="../assets/images/progress.png" style="max-width: 100%;margin-bottom:20px;">
+
+<div class="alert alert-warning" role="alert">
+  <i class="fas fa-exclamation-triangle icon-web"></i> The progress display is not 
+  thread safe, and using it together with other interactive components such as 
+  prompts, status displays or other progress displays are not supported.
+</div>
+
+If the current terminal isn't considered "interactive", such as when running 
+in a continuous integration system, or the terminal can't display 
+ANSI control sequence, any progress will be displayed in a simpler way.
+
+<img src="../assets/images/progress_fallback.png" style="max-width: 100%;">
+
+# Usage
+
+```csharp
+// Synchronous
+AnsiConsole.Progress()
+    .Start(ctx => 
+    {
+        // Define tasks
+        var task1 = ctx.AddTask("[green]Reticulating splines[/]");
+        var task2 = ctx.AddTask("[green]Folding space[/]");
+
+        while(!ctx.IsFinished) 
+        {
+            task1.Increment(1.5);
+            task2.Increment(0.5);
+        }
+    });
+```
+
+## Asynchronous progress
+
+If you prefer to use async/await, you can use `StartAsync` instead of `Start`.
+
+```csharp
+// Asynchronous
+await AnsiConsole.Progress()
+    .StartAsync(async ctx =>
+    {
+        // Define tasks
+        var task1 = ctx.AddTask("[green]Reticulating splines[/]");
+        var task2 = ctx.AddTask("[green]Folding space[/]");
+
+        while (!ctx.IsFinished)
+        {
+            // Simulate some work
+            await Task.Delay(250);
+
+            // Increment
+            task1.Increment(1.5);
+            task2.Increment(0.5);
+        }
+    });
+```
+
+# Configure
+
+```csharp
+// Asynchronous
+AnsiConsole.Progress()
+    .AutoRefresh(false) // Turn off auto refresh
+    .AutoClear(false)   // Do not remove the task list when done
+    .HideCompleted(false)   // Hide tasks as they are completed
+    .Columns(new ProgressColumn[] 
+    {
+        new TaskDescriptionColumn(),    // Task description
+        new ProgressBarColumn(),        // Progress bar
+        new PercentageColumn(),         // Percentage
+        new RemainingTimeColumn(),      // Remaining time
+        new SpinnerColumn(),            // Spinner
+    })
+    .Start(ctx =>
+    {
+        // Omitted
+    });
+```

docs/input/live/status.md

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+Title: Status
+Order: 6
+RedirectFrom: status
+---
+
+Spectre.Console can display information about long running tasks in the console. 
+
+<img src="../assets/images/status.gif" style="max-width: 100%;margin-bottom:20px;">
+
+<div class="alert alert-warning" role="alert">
+  <i class="fas fa-exclamation-triangle icon-web"></i> The status display is not 
+  thread safe, and using it together with other interactive components such as 
+  prompts, progress displays or other status displays are not supported.
+</div>
+
+If the current terminal isn't considered "interactive", such as when running 
+in a continuous integration system, or the terminal can't display 
+ANSI control sequence, any progress will be displayed in a simpler way.
+
+# Usage
+
+```csharp
+// Synchronous
+AnsiConsole.Status()
+    .Start("Thinking...", ctx => 
+    {
+        // Simulate some work
+        AnsiConsole.MarkupLine("Doing some work...");
+        Thread.Sleep(1000);
+        
+        // Update the status and spinner
+        ctx.Status("Thinking some more");
+        ctx.Spinner(Spinner.Known.Star);
+        ctx.SpinnerStyle(Style.Parse("green"));
+
+        // Simulate some work
+        AnsiConsole.MarkupLine("Doing some more work...");
+        Thread.Sleep(2000);
+    });
+```
+
+## Asynchronous progress
+
+If you prefer to use async/await, you can use `StartAsync` instead of `Start`.
+
+```csharp
+// Asynchronous
+await AnsiConsole.Status()
+    .StartAsync("Thinking...", async ctx => 
+    {
+        // Omitted
+    });
+```
+
+# Configure
+
+```csharp
+AnsiConsole.Status()
+    .AutoRefresh(false)
+    .Spinner(Spinner.Known.Star)
+    .SpinnerStyle(Style.Parse("green bold"))
+    .Start("Thinking...", ctx => 
+    {
+        // Omitted
+        ctx.Refresh();
+    });
+```